Human-powered energy refers to the energy generated by human physical activity. This can include activities like pedaling a bicycle, walking, or even using hand-cranked devices. The energy produced can be harnessed to power small devices, charge batteries, or contribute to larger energy systems. Examples of human-powered energy include bicycle generators that convert pedaling into electricity and hand-crank flashlights that provide light without batteries. This form of energy is sustainable and environmentally friendly, as it relies on human effort rather than fossil fuels or electricity from the grid.